Use C++ <cmath> instead of <math.h>

Including math.h can pollute the default namespace, and break
some compilers if cmath versions of the method are declared as using.

Switching to C++ math functions also greatly simplifies handling of
float qreal as C++ automatically chooses the right method.

[ChangeLog][QtCore][QtMath] qmath.h no longer includes math.h, so any
sources depending on that indirect inclusion may fail to build.

Change-Id: I4d0e331dafba354ec05dc5052e61ef4ff8d387fe
Reviewed-by: Rafael Roquetto <rafael.roquetto@kdab.com>

1 files changed, 8 insertions, 8 deletions

diff --git a/src/gui/math3d/qmatrix4x4.cpp b/src/gui/math3d/qmatrix4x4.cpp
index 42aae6c20c..c196f7cff8 100644
--- a/src/gui/math3d/qmatrix4x4.cpp
+++ b/src/gui/math3d/qmatrix4x4.cpp
@@ -1125,8 +1125,8 @@ void QMatrix4x4::rotate(float angle, float x, float y, float z)
         c = -1.0f;
     } else {
         float a = angle * M_PI / 180.0f;
-        c = cosf(a);
-        s = sinf(a);
+        c = std::cos(a);
+        s = std::sin(a);
     }
     if (x == 0.0f) {
         if (y == 0.0f) {
@@ -1186,7 +1186,7 @@ void QMatrix4x4::rotate(float angle, float x, float y, float z)
                  double(y) * double(y) +
                  double(z) * double(z);
     if (!qFuzzyCompare(len, 1.0) && !qFuzzyIsNull(len)) {
-        len = sqrt(len);
+        len = std::sqrt(len);
         x = float(double(x) / len);
         y = float(double(y) / len);
         z = float(double(z) / len);
@@ -1234,8 +1234,8 @@ void QMatrix4x4::projectedRotate(float angle, float x, float y, float z)
         c = -1.0f;
     } else {
         float a = angle * M_PI / 180.0f;
-        c = cosf(a);
-        s = sinf(a);
+        c = std::cos(a);
+        s = std::sin(a);
     }
     if (x == 0.0f) {
         if (y == 0.0f) {
@@ -1282,7 +1282,7 @@ void QMatrix4x4::projectedRotate(float angle, float x, float y, float z)
                  double(y) * double(y) +
                  double(z) * double(z);
     if (!qFuzzyCompare(len, 1.0) && !qFuzzyIsNull(len)) {
-        len = sqrt(len);
+        len = std::sqrt(len);
         x = float(double(x) / len);
         y = float(double(y) / len);
         z = float(double(z) / len);
@@ -1487,10 +1487,10 @@ void QMatrix4x4::perspective(float verticalAngle, float aspectRatio, float nearP
     // Construct the projection.
     QMatrix4x4 m(1);
     float radians = (verticalAngle / 2.0f) * M_PI / 180.0f;
-    float sine = sinf(radians);
+    float sine = std::sin(radians);
     if (sine == 0.0f)
         return;
-    float cotan = cosf(radians) / sine;
+    float cotan = std::cos(radians) / sine;
     float clip = farPlane - nearPlane;
     m.m[0][0] = cotan / aspectRatio;
     m.m[1][0] = 0.0f;